The paper presented in this MaCCI/EPoS Virtual IO Seminar studies the effects of the EU’s General Data Protection Regulation (GDPR) on the ability of firms to collect consumer data, identify consumers over time, accrue revenue via online advertising, and predict their behavior. Utilizing a novel dataset by an intermediary that spans much of the online travel industry, the authors perform a difference-in-differences analysis that exploits the geographic reach of GDPR. They find a 12.5% drop in the intermediary-observed consumers as a result of the new opt-in requirement of GDPR. At the same time, the remaining consumers are observable for a longer period of time. They provide evidence that this pattern is consistent with the hypothesis that privacy-conscious consumers substitute away from less efficient privacy protection (e.g, cookie deletion) to explicit opt out, a process that would reduce the number of artificially short consumer histories. Further in keeping with this hypothesis, they observe that the average value of the remaining consumers to advertisers has increased, offsetting most of the losses from consumers that opt out. Finally, they find that the ability to predict consumer behavior by the intermediary’s proprietary machine learning algorithm does not significantly worsen as a result of the changes induced by GDPR. The results highlight the externalities that consumer privacy decisions have both on other consumers and for firms.


Tobias Salz

Massachusetts Institute of Technology (MIT), Cambridge, USA

The seminars are held on ZOOM. Register with the external registration form to receive reminders, updates, and ZOOM Meeting ID information via e-mail. Seminar presentations are scheduled to last a total of 75 minutes (60 minutes presentations plus 15 minutes Q&A).


14.05.2020 | 15:00 - 16:15 (CET)

Event Location




Head of Junior Research Group